Tire resistant to chemical attack

Abstract

A tire for a rolling assembly comprises a rim and a tire, said tire having at least one carcass reinforcement ( 2 ) surmounted radially on the outside by a crown reinforcement ( 3 ), itself radially on the inside of a tread ( 4 ) having two axially outermost ends, said crown reinforcement ( 3 ) being made up of at least one layer of reinforcing elements, said tread ( 4 ) being connected to two beads ( 5 ) by way of two sidewalls ( 6 ), said beads ( 5 ) being intended to come into contact with a rim ( 7 ) having rim flange tops ( 7 a ), each bead ( 5 ) having at least one circumferential reinforcing element. Each sidewall ( 6 ) comprises at least one set ( 10 ) of sipes ( 11 ) that are substantially parallel and spaced apart at a spacing (Ps) having a value strictly less than 5 mm, each sipe ( 11 ) being formed in the sidewall ( 6 ) with a depth (H) and a width (e), the depth (H) having a value of between one quarter of the value of said spacing (Ps) and the value of said spacing (Ps), and the width (e) having a value strictly less than one quarter of said spacing (Ps).

1 .- 17 . (canceled) 
     
     
         18 . A tire for a rolling assembly comprising a rim and a tire, the tire having at least one carcass reinforcement surmounted radially on the outside by a crown reinforcement, itself radially on the inside of a tread having two axially outermost ends, the crown reinforcement being made up of at least one layer of reinforcing elements, the tread being connected to two beads by way of two sidewalls, the beads being intended to come into contact with a rim having rim flange tops, each bead having at least one circumferential reinforcing element,
 wherein each sidewall comprises at least one set of sipes that are substantially parallel and spaced apart at a spacing having a value strictly less than 5 mm, each sipe being formed in the sidewall with a depth and a width, the depth having a value of between one quarter of the value of the spacing and the value of the spacing, and the width having a value strictly less than one quarter of the spacing.   
     
     
         19 . The tire of  claim 18 , wherein each sipe has a depth having a value of between one third of the value of the spacing and seven tenths of the value of the spacing. 
     
     
         20 . The tire of  claim 18 , wherein the spacing has a value strictly less than 3.5 mm. 
     
     
         21 . The tire of  claim 18 , wherein each sipe has a width having a value strictly less than one tenth of the spacing. 
     
     
         22 . The tire of  claim 18 , wherein each sipe has a width having a value strictly less than one tenth of a quarter of the spacing. 
     
     
         23 . The tire of  claim 18 , wherein each sipe has a width having a value strictly less than 0.45 mm. 
     
     
         24 . The tire of  claim 18 , wherein each sipe has a width having a value less than or equal to 0.3 mm. 
     
     
         25 . The tire of  claim 18 , wherein each sipe has a cross-section having a straight portion of width and extending from the surface of the sidewall, and a circular portion extending from the straight portion, the circular portion having a radius having a value strictly greater than two thirds of the value of the width. 
     
     
         26 . The tire of  claim 18 , wherein the sipes are arranged over the entire area of the sidewall. 
     
     
         27 . The tire of  claim 18 , wherein the sipes are arranged in a region of the sidewall contained at least between a point A and a point C, where the point A is positioned at the junction between the sidewall and the tread, and the point C is positioned on the sidewall where the distance between the two sidewalls of the tire is greatest when the tire is inflated. 
     
     
         28 . The tire of  claim 18 , wherein each sipe extends generally in a longitudinal direction. 
     
     
         29 . The tire of  claim 18 , wherein the sipes are formed on the sidewall in a longitudinal direction so as to form an angle α of between 0° and 60° with the circumferential direction of the tire. 
     
     
         30 . The tire of  claim 18 , wherein each sidewall comprises a second set of sipes, wherein the sipes of the second set form an angle β with the sipes of the set, the angle β being between 70° and 120°. 
     
     
         31 . The tire of  claim 30 , wherein the sipes of the second set have a shape, relative arrangement, or both shape and relative arrangement identical to those of the sipes of the set. 
     
     
         32 . The tire of  claim 18 , wherein the sidewall comprises at least one portion protruding with respect to the surface of the sidewall, the sidewall comprising at least one complementary sipe delimiting the protruding portion. 
     
     
         33 . The tire of  claim 32 , wherein the at least one complementary sipe is formed at the corner edge between the protruding portion and the surface of the sidewall. 
     
     
         34 . The tire of  claim 32 , wherein the at least one complementary sipe has a shape identical to that of the sipes of the set. 
     
     
         35 . The tire of  claim 18 , wherein each sipe has a width having a value less than or equal to 0.2 mm. 
     
     
         36 . The tire of  claim 18 , wherein the sipes are formed on the sidewall in a longitudinal direction so as to form an angle α equal to 45° with the circumferential direction of the tire. 
     
     
         37 . The tire of  claim 18 , wherein each sidewall comprises a second set of sipes, wherein the sipes of the second set form an angle β with the sipes of the set, the angle β being between 80° and 110°. 
     
     
         38 . The tire of  claim 18 , wherein each sidewall comprises a second set of sipes, wherein the sipes of the second set form an angle β with the sipes of the set, the angle β equal to 90°.